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Extra info for Mastering Unix Shell Scripting: Bash, Bourne, and Korn Shell Scripting for Programmers, System Administrators, and UNIX Gurus, Second Edition

Example text

The following is example output: root root root root root root root root root root reboot shutdown root root root root ftp pts/3 pts/2 pts/1 pts/0 pts/0 ftp ftp tty0 tty0 ~ tty0 ftp ftp ftp ftp booboo mrranger mrranger mrranger mrranger mrranger booboo booboo booboo bambam booboo bambam Aug Aug Aug Aug Aug Aug Aug Aug Aug Aug Aug Jul Jul Jul Jul Jul 06 06 06 06 06 06 06 06 06 02 02 31 31 31 31 31 19:22 18:45 18:45 18:44 18:44 18:43 18:19 18:18 18:06 12:24 12:00 23:23 21:19 21:19 20:42 20:41 - 19:23 still still still still - 18:44 - 18:20 - 18:18 still - 17:59 - 21:19 21:19 20:42 20:42 (00:01) logged in.

As we see in the preceding code segment, the use of the $@ or $* is an alternative solution to the same problem, and it was less code to write. Either technique accomplishes the same task. Double Quotes, Forward Tics, and Back Tics How do we know which one of these to use in our scripts, functions, and command statements? This decision causes the most confusion in writing scripts. We are going to set this straight now. Depending on what the task is and the output desired, it is very important to use the correct enclosure.

Some challenges are very complex, whereas others are just interesting to play around with. Some chapters hit the problem from several different angles in a single chapter, and others leave you the challenge to solve on your own — of course, with a few hints to get you started. Each chapter solves the challenge presented and can be read as a single unit without referencing other chapters in the book, except where noted. Some of the material, though, is explained in great detail in one chapter and lightly covered in other chapters.

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